package cn.xabad.commons.tools;


import java.io.File;
import java.io.InputStream;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import cn.xabad.commons.codec.digest.DigestUtils;
import cn.xabad.commons.io.FileUtils;
import cn.xabad.commons.io.IOUtils;

/*
 * MD5 算法
*/
public class MD5 {

    // 全局数组
    private final static String[] strDigits = {"0", "1", "2", "3", "4", "5",
            "6", "7", "8", "9", "a", "b", "c", "d", "e", "f"};

    public MD5() {
    }

    // 返回形式为数字跟字符串
    private static String byteToArrayString(byte bByte) {
        int iRet = bByte;
        // System.out.println("iRet="+iRet);
        if (iRet < 0) {
            iRet += 256;
        }
        int iD1 = iRet / 16;
        int iD2 = iRet % 16;
        return strDigits[iD1] + strDigits[iD2];
    }

    // 返回形式只为数字
    private static String byteToNum(byte bByte) {
        int iRet = bByte;
        System.out.println("iRet1=" + iRet);
        if (iRet < 0) {
            iRet += 256;
        }
        return String.valueOf(iRet);
    }

    // 转换字节数组为16进制字串
    private static String byteToString(byte[] bByte) {
        StringBuffer sBuffer = new StringBuffer();
        for (int i = 0; i < bByte.length; i++) {
            sBuffer.append(byteToArrayString(bByte[i]));
        }
        return sBuffer.toString();
    }

    public static String GetMD5Code(String strObj) {
        String resultString = null;
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            // md.digest() 该函数返回值为存放哈希值结果的byte数组

            resultString = byteToString(md.digest(strObj.getBytes()));
        } catch (NoSuchAlgorithmException ex) {
            ex.printStackTrace();
        }
        return resultString;
    }


    public static boolean checkFileMd5(String filePath, String resourcecode) {
        File file = new File(filePath);
        if (!file.exists()) return false;
        return checkFileMd5(file, resourcecode);
    }

    public static boolean checkFileMd5(File file, String resourcecode) {
        String curMD5 = "";

        //File file = new File(A.filePath()+resource.getSavepath());
        InputStream input = null;
        try {
            input = FileUtils.openInputStream(file);
            curMD5 = DigestUtils.md5Hex(input);
        } catch (Exception e) {
            return false;
        } finally {
            IOUtils.closeQuietly(input);
        }
        System.out.println(curMD5);
        return StringU.equals(curMD5, resourcecode);
    }

    public static String GetMD5Code16(byte[] bytes) {
        String resultString = null;
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            resultString = byteToString(md.digest(bytes));
        } catch (NoSuchAlgorithmException ex) {
            ex.printStackTrace();
        }
        return StringU.substring(resultString, 0, 16);
    }

    public static void main(String[] args) {
        System.out.println(checkFileMd5("/Users/xueyong/Downloads/video_00_3_0039bae67a9b59ecae05f3dda0e8508c","0039bae67a9b59ecae05f3dda0e8508c"));
    }
}
